JP2921391B2 - Video special effects device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video special effect device, and more particularly to a video special effect device for generating a frame or border (hereinafter referred to as a border) on a video.

[0002]

2. Description of the Related Art In television screens and the like, a variety of video expressions with a border effect applied to a base video are performed.
Many special effect devices for that purpose have been proposed.

FIG. 4 is a block diagram showing an example of a conventional digital video special effect device for generating a border effect. In the figure, a digital video signal Y and a digital video signal C are supplied to a mixer circuit 101 for a luminance signal.
And each video (V) of the mixer circuit 102 for color difference signals
Input to each terminal. Note that Y represents a luminance signal, and C represents a color difference signal. The same applies hereinafter.

A border signal generating circuit 103 for a luminance signal and a border generating circuit 104 for a chrominance signal respectively have a border signal (Y) and a border signal (C) according to CPU control data.
To the border (B) terminals of the mixer circuits 101 and 102.

[0005] The border key generation circuit 105 includes CPU control data, a horizontal reference signal HCLR, and a vertical reference signal VCLR.
And a clock signal CLK to generate a border key signal.
Y) Output to terminal.

The mixer circuit 101 mixes the video signal Y and the border signal (Y) using a border key signal,
It outputs a video signal Y with a border. Similarly, the mixer circuit 102 mixes the video signal C and the border signal (C) using the border key signal, and outputs a video signal C with a border.

FIG. 5 shows an example of the operation of generating the border effect in the above-mentioned conventional configuration. A digital video signal A (FIG. 10A) and a border signal B (FIG. 10B) are mixed by the miskey circuits 101 and 102 using the border key signal (FIG. 10C), and are trimmed. ((D) in the figure) are output as video signals Y and C with a border.

The brightness and the color difference of the border can be freely changed by CPU control data.
There is an apparatus disclosed in Japanese Patent Application Laid-Open No. 4 (1999) -86.

[0009]

However, in the above-described conventional apparatus, since the coloring of the border is changed, it is not possible to generate a border effect to which a pattern is further added, and various image expressions are limited. Will be done.

It is an object of the present invention to provide a video special effect device which can easily generate a border effect to which a desired pattern is added.

[0011]

SUMMARY OF THE INVENTION A video special effect device according to the present invention generates a border effect on a video by mixing a base video signal and a border signal using a border key signal. A design border memory storing a border, read control means for reading a design border signal from the design border memory, and border signal synthesizing means for synthesizing the border signal and the read design border signal to generate a synthesized border signal And mixing means for mixing the base video signal and the synthesized border signal using the border key signal.

The read control means may operate in accordance with a reference clock and perform read control asynchronous with the video signal, and is preferably a free-run counter. The count data is used as a read address of the design border memory.

It is preferable that the apparatus further comprises level control means for controlling the level of the design border signal read from the design border memory independently of the border signal.

[0014]

A design border of a desired pattern is stored in a memory, read out and combined with a border signal to generate a combined border signal, and a video signal and a combined border signal are mixed using a border key signal. , A border effect having a desired pattern can be generated.

Further, by performing the asynchronous reading by the reading control means, it is possible to obtain a special effect that the pattern of the border portion is constantly fluctuated by the design border signal.

Further, by controlling the level of the design border signal separately from the border signal, it is possible to arbitrarily set the intensity and color of the pattern component of the border effect.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a video special effect apparatus according to the present invention. In the figure, a design border signal generation circuit 6 surrounded by a broken line is a main part of the present invention, and is different from the circuit of FIG. 4 shown as a conventional example.

In FIG. 1, a digital video signal Y and a digital video signal C are input to respective video (V) terminals of mixer circuits 1 and 2, respectively. The luminance signal border generating circuit 3 and the color difference signal border generating circuit 4
A border signal (Y) and a border signal (C) are generated according to the control data. These border signals are combined with the design border signal generated by the design border signal generation circuit 6 and input to the respective border (B) terminals of the mixer circuits 1 and 2. Also, a border key generating circuit 5
Receives the CPU control data, the horizontal reference signal HCLR, the vertical reference signal VCLR, and the clock signal CLK, generates a border key signal, and outputs the border key signal to each key (KEY) terminal of the mixer circuits 1 and 2.

The mixer circuit 1 mixes the digital video signal Y and the synthesized border signal (Y) using a border key signal, and outputs a video signal Y with a design border. Similarly, the mixer circuit 2 mixes the digital video signal C and the synthesized border signal (C) using the border key signal, and outputs a video signal C with a design border.

The design border signal generation circuit 6, which is a main part of the present invention, comprises a free-run counter 10, design border ROMs (read only memories) 11 and 12, level control circuits 13 and 14, and addition circuits 15 and 16. ing.

The free-run counter 10 receives the clock signal C
The counting operation is performed according to the LK, but is not synchronized with the video synchronization signal. The count data of the free-run counter 10 is input to the design border ROMs 11 and 12,
Determine the read address.

The design border ROM 11 stores a luminance signal pattern (pattern) of the design border, decodes count data output from the free-run counter 10, and outputs a design border signal (Y) from the address. The design border ROM 12 stores a color difference signal pattern (pattern) of the design border, decodes count data output from the free-run counter 10, and outputs a design border signal (C) at a corresponding address.

The level control circuit 13 changes the luminance level of the design border signal output from the design border ROM 11 according to the CPU control data. The level control circuit 14 similarly changes the color difference level of the design border signal output from the design border ROM 12 according to the CPU control data. These level control circuits 13
And 14 are provided independently of the border generation circuits 3 and 4, so that the luminance and color difference levels of the design border signal can be freely changed without being restricted by the border screen. Note that the level control circuits 13 and 14
For example, it is configured by a multiplication circuit.

The adding circuit 15 adds the design border signal (Y) output from the level control circuit 13 and the border signal (Y) output from the border generating circuit 3 to generate a combined border signal (Y). Output to circuit 1. Further, the adder circuit 16 adds the design border signal (C) output from the level control circuit 14 and the border signal (C) output from the border generation circuit 4 to generate a combined border signal (C). Output to

The operation of this embodiment having such a configuration will be described with reference to FIGS.

FIG. 2 is a schematic diagram showing a screen display of various signals for explaining the operation of the present embodiment. First, a screen A in FIG. 3A is a base video composed of digital video signals Y and C. The digital video signal Y is input to the V terminal of the mixer circuit 1 and the digital video signal C is To the V terminal.

Screen B shown in FIG. 3B is a screen of a border signal composed of border signals Y and C output from border generation circuits 3 and 4, respectively, as in the conventional example. These border signals are added to adders 15 and 1 respectively.
6 and is added to the design border signal. The brightness and color difference of each output border signal of the border generation circuits 3 and 4 are determined according to the CPU control data.

The screen D shown in FIG. 3C is a screen formed by the design border signals (Y) and (C) output from the design border ROMs 11 and 12, respectively.
This design pattern is stored in the design border ROMs 11 and 12, and is read out according to the count data output from the free-run counter 10, respectively.
The read design border signals (Y) and (C) are
The level is controlled by level control circuits 13 and 14, respectively.
And (C), and output to the B terminals of the mixer circuits 1 and 2 as synthesized border signals (Y) and (C).

The mixer circuits 1 and 2 respectively combine the video signal and the composite border signal using the border key signal shown in FIG. 4D to generate a video signal with a design border. Thus, as shown in FIG. 9E, a composite screen is formed in which the video screen of the screen A is bordered by the screens B and D.

Although FIG. 2 shows an example of a screen having a vertical border, a border effect can be given in the horizontal direction or in both the horizontal and vertical directions by the border key signal output from the border key generating circuit 5. .

FIG. 3 is a schematic diagram showing in more detail another example of a screen of a video signal with a design border obtained by this embodiment. In the figure, a video screen 31 is bordered on all sides by a border screen 32 and a pattern 33. Here, the video screen 31 is the screen A in FIG. 2A, the border screen 32 corresponds to the screen B in FIG. 2B, and the pattern 33 corresponds to the screen D in FIG. 2C. That is, the adder circuits 15 and 16 combine the border signal of the border screen 32 and the design border signal of the pattern 33 to border the video screen 31.

It should be noted that the design border signal of the screen D in FIG. 2C, ie, the pattern 3 in FIG.
3 is read from the design border ROMs 11 and 12 by the asynchronous free-run counter 10,
This is a point that the image is not displayed statically but always moves. This makes the design border more effective.

The design border ROMs 11 and 12
May store a desired design pattern, and is not limited to FIG. A configuration in which a plurality of design patterns are stored and one of them is selected appropriately or sequentially with time can be easily considered.

[0035]

As described in detail above, the video special effect device according to the present invention stores a design border of a desired pattern in a memory, reads out the design border and combines it with a border signal to generate a combined border signal. Then, the video signal and the composite border signal are mixed using the border key signal. As a result, a border effect having a desired pattern can be generated, and the types of the border effect can be varied.

Further, by reading out the design border asynchronously, it is possible to obtain a special effect that the pattern of the border portion always changes due to the design border signal.

Further, by controlling the level of the design border signal separately from the border signal, it is possible to arbitrarily set the intensity and color of the pattern component of the border effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a video special effect device according to the present invention.

FIG. 2 is a schematic diagram showing a screen display of various signals for explaining the operation of the present embodiment.

FIG. 3 is a schematic diagram showing another example of a screen of a video signal with a design border obtained by the present embodiment in more detail.

FIG. 4 is a block diagram showing an example of a conventional digital video special effect device for generating a border effect.

FIG. 5 is a schematic diagram showing a screen display of various signals for explaining the operation of the conventional device.

[Explanation of symbols]

 Reference Signs List 1 mixer circuit (for luminance) 2 mixer circuit (for color difference) 3 border generation circuit (for luminance) 4 border generation circuit (for color difference) 5 border key generation circuit 6 design border signal generation circuit 10 free-run counter 11 design border ROM (luminance 12 Design border ROM (for color difference) 13 Level control circuit (for luminance) 14 Level control circuit (for color difference) 15 Addition circuit (for luminance) 16 Addition circuit (for color difference)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-23193 (JP, A) JP-A-60-263189 (JP, A) JP-A-4-252676 (JP, A) JP-A-1- 194574 (JP, A) JP-A-2-194778 (JP, A) JP-A-62-268388 (JP, A) JP-A-1-318361 (JP, A) JP-A-59-182677 (JP, A) JP-A-5-236350 (JP, A) JP-A-5-284425 (JP, A) JP-A-2-27664 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 5/262-5/28 H04N 9/74

Claims (3)

(57) [Claims] An image special effect device for generating a border effect on an image by mixing a base image signal and a border signal using a border key signal, comprising: a design border memory storing a design border of a desired pattern; Asynchronous read control means for asynchronously reading a design border signal from a border memory; border signal synthesizing means for synthesizing the border signal and the read design border signal to generate a synthesized border signal; Mixing means for mixing a signal and the synthesized border signal using the border key signal. 2. A video special effect device for generating a border effect on a video by mixing a base video signal and a border signal using a border key signal, comprising: a design border memory storing a design border of a desired pattern; Asynchronous read control means for asynchronously reading a design border signal from a border memory; level control means for controlling the level of the read design border signal independently of the border signal; and the border signal and the level. A border signal synthesizing means for synthesizing the controlled design border signal to generate a synthesized border signal, and a mixing means for mixing the base video signal and the synthesized border signal using the border key signal. Special video effect device. 3. The video special device according to claim 1, wherein said asynchronous read control means is a free-run counter operated by a reference clock, and outputs the count data to said design border memory as a read address. Effect device.